Calculation of magnetization of the ternary single crystal compound
Ternary rare
earth compounds RM2X2 (R = rare earth, M = Rh, Ru, X = Si or
Ge) crystallize in the tetragonal ThCr2Si2-type structure
(I4/mmm) [
The compound shows an antiferromagnetic behavior with neel temperature
of 50 K. In the temperature dependence of magnetic susceptibility, there
is another anomaly at 37 K which indicates a magnetic transition. A magnetic transition is also suggested at 20 K from
magnetization measurements. There is
a strong uniaxial magnetic anisotropy with the easy At a low
temperature, a four-step metamagnetic process appears along the easy The
Experimental magnetization versus applied field for NdRh2Ge2 at
Molecular
field coefficients
In the present study, in order to explain this complex magnetic
behavior, calculations of
the magnetization and an analysis of moment arrangements at various temperatures and under various
magnetic fields have been carried out with a wave-like molecular
field model [
The s-f
interaction may be an important interaction in metallic rare earth compounds.
Considering this interaction of
The molecular
field acting on an atom on the
For the sake
of calculating the magnetic processes by the wave-like molecular field model, knowledge
of magnetic structures is required. Only antiferromagnetic structure has been
reported on the NdRh2Ge2 compound;
it is a simple structure having the propagation vector
On most of compounds which show an Ising-like
multistep metamagnetic process along the
Molecular-field
coefficients
The calculated
Nd magnetic moment arrangements at various temperatures in nonexternal magnetic
field together with the wave-like molecular fields
(a) Moment arrangements and wave-like molecular fields (solid curves) at 4 K, (b) at 33 K, and (c) at 40 K. The open circles represent paramagnetic Nd.
Figures
(a) Moment
arrangements along the
The calculated magnetization process at
4.2 K under applied fields is shown in Figure
The calculated
Magnetic
phase diagram along the
The
interesting magnetic behavior on the NdRh2Ge2 single crystal had been
reported; successive magnetic phase transitions occur at 20 K, 37 K, and 50 K